. The biology of spiders. Spiders; Insects. THE SPIDER'S WEB H7 would make a circle, not a spiral; therefore as the spider turns round, the foreleg is gradually extended more and more until, when the first round is completed, the leg can be drawn in and placed on the spot at which the spiral began. Further circlings with the foreleg on the inner spiral turn, and the spinnerets still paying out the thread, will complete the four or five circles of non-viscid spiral, each a measured body-length from the turn within. The third and last problem is the accurate placing of. Fig. 65.—Making an Orb-we
. The biology of spiders. Spiders; Insects. THE SPIDER'S WEB H7 would make a circle, not a spiral; therefore as the spider turns round, the foreleg is gradually extended more and more until, when the first round is completed, the leg can be drawn in and placed on the spot at which the spiral began. Further circlings with the foreleg on the inner spiral turn, and the spinnerets still paying out the thread, will complete the four or five circles of non-viscid spiral, each a measured body-length from the turn within. The third and last problem is the accurate placing of. Fig. 65.—Making an Orb-web. the viscid spiral. The spider puts down the outermost ring of this by taking the same number of outward steps from the last ring of the first spiral before it fixes the viscid thread in position. In this way the first ring is measured out all the way round, and all the inner turns of spiral are " reckoned " from it. At the moment of attaching the viscid thread with the fourth leg, the spider is feeling with its first leg the position of the point of attachment of the outer ring in the segment next in front. Thus, in Fig. 65,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Savory, Theodore Horace, 1896-. London : Sidgwick & Jackson
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecti, booksubjectspiders
